L&T Company Numerical Ability Simple & Compound Interest

Mukesh borrowed a sum of Rs. 10000 at simple interest from a bank. After two years he takes Rs. 12000 more as loan and discharge all the debt at the end of next 3 years depositing Rs. 27160 to the bank. What is the rate of interest per annum?
(a) 5%
(b) 6%
(c) 8%
(d) 10%
(e) None of these

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L&T Other Question

A sum of Rs. 2900 amounts to Rs. 3422 in 3 years. Had the rate of interest be 3% higher then what would the sum amount in the same time period?
(a) Rs. 4465
(b) Rs. 3683
(c) Rs. 3596
(d) Data inadequate
(e) None of these
The ratio of the present ages of Ram and Rahim is 3 : 2. The ratio of the present ages of Rahim and Aman is 5 : 2. What is the ratio of the present ages of Ram and Aman?
(a) 4 : 15
(b) 15 : 4
(c) 9 : 5
(d) Cannot be determined
(e) None of these